LM120K-12 National Semiconductor, LM120K-12 Datasheet

LM120K-12

Manufacturer Part Number

LM120K-12

Description

Series 3-Terminal Negative Regulators

Manufacturer

National Semiconductor

Datasheet

1.LM120K-12.pdf (12 pages)

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C 1995 National Semiconductor Corporation

LM120 LM320

Series 3-Terminal Negative Regulators

General Description

The LM120 series are three-terminal negative regulators

with a fixed output voltage of

up to 1 5A load current capability Where other voltages are

required the LM137 and LM137HV series provide an output

voltage range of

The LM120 need only one external component a compen-

sation capacitor at the output making them easy to apply

Worst case guarantees on output voltage deviation due to

any combination of line load or temperature variation as-

sure satisfactory system operation

Exceptional effort has been made to make the LM120 Se-

ries immune to overload conditions The regulators have

current limiting which is independent of temperature com-

bined with thermal overload protection Internal current limit-

ing protects against momentary faults while thermal shut-

down prevents junction temperatures from exceeding safe

limits during prolonged overloads

Although primarily intended for fixed output voltage applica-

tions the LM120 Series may be programmed for higher out-

put voltages with a simple resistive divider The low quies-

cent drain current of the devices allows this technique to be

used with good regulation

Typical Applications

Dual Trimmed Supply

1 2V to

TL H 7767– 3

TL H 7767

47V

12V and

15V and

Features

Required if regulator is separated from filter capacitor by more than 3

value given capacitor must be solid tantalum 25 F aluminum electrolytic

may be substituted

Required for stability For value given capacitor must be solid tantalum 25

without limit

For output capacitance in excess of 100

input to output (1N4001 etc ) will protect the regulator from momentary

input shorts

LM120 LM320

LM320

LM320M

F aluminum electrolytic may substituted Values given may be increased

Preset output voltage error less than

Preset current limit

Internal thermal shutdown

Operates with input-output voltage differential down to

Excellent ripple rejection

Low temperature drift

Easily adjustable to higher output voltage

Device

LM120 Series Packages and Power Capability

TO-3 (K)

TO-39 (H)

TO-220 (T)

TO-202 (P)

Package

Fixed Regulator

Dissipation

F a high current diode from

Power

Rated

7 5W

20W

15W

RRD-B30M115 Printed in U S A

November 1994

TL H 7767 – 2

Current

Design

Load

1 5A

0 5A

1 5A

0 5A

For

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